The embryo sac in female gametophyte is seven cells and eight nucleated structure. Justify the statement with the help of a labelled diagram.

Explanation

To justify the statement that the embryo sac in the female gametophyte is a seven-celled and eight-nucleated structure, we can break down the explanation into several steps and provide a labeled diagram to illustrate the structure.

### Step-by-Step Solution:

1. **Understanding the Structure**: The embryo sac is formed from a single functional megaspore after a series of mitotic divisions. It is crucial to understand that the embryo sac consists of seven cells and eight nuclei.

2. **Formation of the Megaspore**: Initially, the megaspore mother cell (megaspore mother cell) undergoes meiosis to produce four megaspores. Out of these, three degenerate, leaving one functional megaspore.

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